You can back up Salesforce metadata. By default, the Commvault software does not include the Salesforce metadata in backups..
Procedure
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In the CommCell Browser, expand Client Computers > client > Cloud Apps > instance > backup_set. 
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Right-click the default, point to All Tasks, and then click Properties. The Subclient Properties dialog box appears. 
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On the Content tab, select the Metadata check box. 
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Click OK.